Standard TTY port that can be loaded/unloaded via serdev sysfs. This serdev driver can only be used by serdev controllers that are compatible with ttyport.
Cc: Rob Herring <[email protected]> Cc: Johan Hovold <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Jiri Slaby <[email protected]> Signed-off-by: Ricardo Ribalda Delgado <[email protected]> --- drivers/tty/serdev/Kconfig | 11 +++++ drivers/tty/serdev/Makefile | 2 + drivers/tty/serdev/serdev-ttydev.c | 70 ++++++++++++++++++++++++++++++ 3 files changed, 83 insertions(+) create mode 100644 drivers/tty/serdev/serdev-ttydev.c diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig index 1dbc8352e027..d19bf689a424 100644 --- a/drivers/tty/serdev/Kconfig +++ b/drivers/tty/serdev/Kconfig @@ -21,4 +21,15 @@ config SERIAL_DEV_CTRL_TTYPORT depends on SERIAL_DEV_BUS != m default y +config SERIAL_DEV_CTRL_TTYDEV + tristate "TTY port dynamically loaded by the Serial Device Bus" + help + Say Y here if you want to create a bridge driver between the Serial + device bus and the TTY chardevice. This driver can be dynamically + loaded/unloaded by the Serial Device Bus. + + If unsure, say Y. + depends on SERIAL_DEV_CTRL_TTYPORT + default m + endif diff --git a/drivers/tty/serdev/Makefile b/drivers/tty/serdev/Makefile index 0cbdb9444d9d..5c807b77d12d 100644 --- a/drivers/tty/serdev/Makefile +++ b/drivers/tty/serdev/Makefile @@ -3,3 +3,5 @@ serdev-objs := core.o obj-$(CONFIG_SERIAL_DEV_BUS) += serdev.o obj-$(CONFIG_SERIAL_DEV_CTRL_TTYPORT) += serdev-ttyport.o + +obj-$(CONFIG_SERIAL_DEV_CTRL_TTYDEV) += serdev-ttydev.o diff --git a/drivers/tty/serdev/serdev-ttydev.c b/drivers/tty/serdev/serdev-ttydev.c new file mode 100644 index 000000000000..66479d6534dd --- /dev/null +++ b/drivers/tty/serdev/serdev-ttydev.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Ricardo Ribalda <[email protected]> + * + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/serdev.h> +#include <linux/tty.h> +#include "serport.h" + +static int ttydev_serdev_probe(struct serdev_device *serdev) +{ + struct serdev_controller *ctrl = serdev->ctrl; + struct serport *serport; + struct device *dev; + + if (!ctrl->is_ttyport) + return -ENODEV; + + serport = serdev_controller_get_drvdata(ctrl); + + dev = tty_register_device_attr(serport->tty_drv, serport->tty_idx, + &serdev->dev, NULL, NULL); + + return dev ? 0 : PTR_ERR(dev); +} + +static void ttydev_serdev_remove(struct serdev_device *serdev) +{ + struct serdev_controller *ctrl = serdev->ctrl; + struct serport *serport; + + serport = serdev_controller_get_drvdata(ctrl); + tty_unregister_device(serport->tty_drv, serport->tty_idx); +} + +static const struct serdev_device_id ttydev_serdev_id[] = { + { "ttydev", }, + { "ttydev_serdev", }, + {} +}; +MODULE_DEVICE_TABLE(serdev, ttydev_serdev_id); + +static struct serdev_device_driver ttydev_serdev_driver = { + .probe = ttydev_serdev_probe, + .remove = ttydev_serdev_remove, + .driver = { + .name = "ttydev_serdev", + }, + .id_table = ttydev_serdev_id, +}; + +static int __init ttydev_serdev_init(void) +{ + return serdev_device_driver_register(&ttydev_serdev_driver); +} +module_init(ttydev_serdev_init); + +static void __exit ttydev_serdev_exit(void) +{ + return serdev_device_driver_unregister(&ttydev_serdev_driver); +} +module_exit(ttydev_serdev_exit); + +MODULE_AUTHOR("Ricardo Ribalda <[email protected]>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Serdev to ttydev module"); -- 2.17.0
